Revision 1878415

Merge the r1876707 group from trunk:

 * r1876707, r1876734, r1877318, r1877712, r1878141, r1878142, r1878143,
   r1878144
   Various fixes for making the test suite run correctly with Python 3 on
   Windows. 
   Justification:
     Our test suite should test Subversion correctly also on Windows with
     Python 3
   Votes:
     +1: futatuki, jcorvel, stsp